Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecb1d460ab40d72b…

MALICIOUS

PDF

90.9 KB Created: 2021-08-20 10:08:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: e19d2aac91102ee8f69c4da84d6c5e3d SHA-1: ef90e652c8b1fd82772237fd1031664de49f3b16 SHA-256: ecb1d460ab40d72b722525286c1574408ad86d8afe8fd6646576498361c7e70b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple compromised CMS upload directories and disposable hosting, suggesting an attempt to obscure the final destination or host malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution lure, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://rallyteamwalraven.nl/file/18847300621.pdf In PDF document text
    • https://www.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/rimarenubawomarosubizoj.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/bcf94db604a70f1b66620708e0af43be/jated.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/15459503350.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/3100e73c9e7caf58905b14561fd1d0fa/14068773293.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/168be1b6763e4f539c32ed0fa20b58a9/13560769435.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/95okuh1m2a0881n4je4dmntb31/83039181146.pdfIn PDF document text
    • http://ck-tct.ru/userfiles/file/89078014263.pdfIn PDF document text
    • http://mlead.net/images/e/file/siwujidamo.pdfIn PDF document text
    • http://auapp.ch/userfiles/files/bosomipofamomesigikugaw.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160769ed1ee697---5481508493.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607247c5eefb5---34401405684.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083178768638---63590235870.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/6f51444f54f560e7a3928b34de4a1db6/tiped.pdfIn PDF document text
    • https://mimpishio1bet.net/contents/files/9360557165.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/debakikajubirol.pdfIn PDF document text
    • http://highlevel.pl/userfiles/file/xutumigot.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/nimobifavu.pdfIn PDF document text
    • https://777mto.com/contents//files/runivugenakugekugabizivad.pdfIn PDF document text
    • https://dascalita.ro/app/webroot/files/userfiles/files/vuguliwiwul.pdfIn PDF document text
    • http://wksx.top/images/userfiles/file/46064615710.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/luwaragubime.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=the+stone+sky+summaryPDF link annotation
    • http://pro.ovh.net/~tribuene/images/banque/file/7557302810.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE94 19504 bytes
SHA-256: a6c0465bb2bff5da347105c6e3c255b4fa8e5fc0048e4b11eca7c8949bea212a
font_01_sfnt_off00010ef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12701 18552 bytes
SHA-256: 9feed9be9f7f7bb670a87bae22c3035f3dab8286ab023bbec34d316c23fe80e0
font_03_sfnt_off000144e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144E8 10504 bytes
SHA-256: 063acb5dce5e619a4787a5b60d856e57d350c91655cfaf9dd308df71fca532b0

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